MPs differ from everyone else in that there is no summary dismissal. If they do not resign, or go to prison, only lengthy inquiries and cumbersome recall petitions can get rid.
Even MPs loyal to the Prime Minister fear he will be in trouble if the party suffers catastrophic defeats in crucial mayoral and local council polls on Thursday.
Ex-Tory MP Mark Menzies is one of a raft of MPs who stands to pocket tens of thousands in severance payments if he clings on to his seat - but not if he steps down and triggers a by-election
Dr Dan Poulter, a working medic, has quit Rishi Sunak's party saying it is "failing" the health service and that he could no longer "look my NHS colleagues in the eye" as a Conservative.
The ex-health minister, who works part time as a doctor, said he found it 'increasingly difficult to look his NHS colleagues in the eye' while being a Tory
The mental health doctor, who was elected as a Tory MP in 2010, said the Conservatives had become a “nationalist party of the right”, and no longer prioritised the NHS